S-94066A848 4-40 x 3/4" Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws
Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for reliable load-bearing performance
- Secure tamper-resistant fastening through drilled spanner drive (No. 4) design, preventing unauthorized access
- Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring vibration resistance and easy installation
- Full-length threading provides maximum grip across the entire 3/4" length for superior holding power
- Rounded pan head profile offers low-profile installation while distributing clamping force effectively
- Environmental compliance with RoHS 3 and REACH regulations for safe use across regulated industries
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws deliver critical performance advantages in demanding applications where corrosion resistance and tamper-proof security are paramount. The 18-8 stainless steel material combined with passivated finish creates a protective barrier against chemical exposure and atmospheric corrosion, making these fasteners ideal for marine equipment, food processing machinery, and outdoor industrial installations. The drilled spanner drive system provides both installation security and vandal resistance, while the fully threaded design ensures maximum thread engagement in thin materials and blind holes. With 80,000 psi tensile strength maintaining integrity under dynamic loads, these screws solve critical fastening challenges in electronic enclosures, precision instruments, and assembly lines where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent mating with threaded components. Features UNC coarse thread profile (4-40) with standard right-hand threading direction. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restriction of hazardous substances. Mechanical properties include Rockwell B96 hardness and 80,000 psi tensile strength for demanding industrial applications.
